<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
    #parent{
        width: 200px;
        height: 200px;
        background: red;
    }
    </style>
</head>
<body>
    <div id="parent">
        <div class="one">one</div>
        <div class="two">two</div>
        <div class="three">three</div>
    </div>
    <script>
        var parent = document.getElementById("parent");
        parent.onclick = function(){
            console.log(this);
        }
    </script>
</body>
</html>